--- /dev/null
+From 5abffb66d12bcac84bf7b66389c571b8bb6e82bd Mon Sep 17 00:00:00 2001
+From: Shradha Gupta <shradhagupta@linux.microsoft.com>
+Date: Thu, 1 Feb 2024 22:43:28 -0800
+Subject: drm: Check output polling initialized before disabling
+
+From: Shradha Gupta <shradhagupta@linux.microsoft.com>
+
+commit 5abffb66d12bcac84bf7b66389c571b8bb6e82bd upstream.
+
+In drm_kms_helper_poll_disable() check if output polling
+support is initialized before disabling polling. If not flag
+this as a warning.
+Additionally in drm_mode_config_helper_suspend() and
+drm_mode_config_helper_resume() calls, that re the callers of these
+functions, avoid invoking them if polling is not initialized.
+For drivers like hyperv-drm, that do not initialize connector
+polling, if suspend is called without this check, it leads to
+suspend failure with following stack
+[ 770.719392] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
+[ 770.720592] printk: Suspending console(s) (use no_console_suspend to debug)
+[ 770.948823] ------------[ cut here ]------------
+[ 770.948824] WARNING: CPU: 1 PID: 17197 at kernel/workqueue.c:3162 __flush_work.isra.0+0x212/0x230
+[ 770.948831] Modules linked in: rfkill nft_counter xt_conntrack xt_owner udf nft_compat crc_itu_t nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables nfnetlink vfat fat mlx5_ib ib_uverbs ib_core mlx5_core intel_rapl_msr intel_rapl_common kvm_amd ccp mlxfw kvm psample hyperv_drm tls drm_shmem_helper drm_kms_helper irqbypass pcspkr syscopyarea sysfillrect sysimgblt hv_balloon hv_utils joydev drm fuse xfs libcrc32c pci_hyperv pci_hyperv_intf sr_mod sd_mod cdrom t10_pi sg hv_storvsc scsi_transport_fc hv_netvsc serio_raw hyperv_keyboard hid_hyperv crct10dif_pclmul crc32_pclmul crc32c_intel hv_vmbus ghash_clmulni_intel dm_mirror dm_region_hash dm_log dm_mod
+[ 770.948863] CPU: 1 PID: 17197 Comm: systemd-sleep Not tainted 5.14.0-362.2.1.el9_3.x86_64 #1
+[ 770.948865] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022
+[ 770.948866] RIP: 0010:__flush_work.isra.0+0x212/0x230
+[ 770.948869] Code: 8b 4d 00 4c 8b 45 08 89 ca 48 c1 e9 04 83 e2 08 83 e1 0f 83 ca 02 89 c8 48 0f ba 6d 00 03 e9 25 ff ff ff 0f 0b e9 4e ff ff ff <0f> 0b 45 31 ed e9 44 ff ff ff e8 8f 89 b2 00 66 66 2e 0f 1f 84 00
+[ 770.948870] RSP: 0018:ffffaf4ac213fb10 EFLAGS: 00010246
+[ 770.948871] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8c992857
+[ 770.948872] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff9aad82b00330
+[ 770.948873] RBP: ffff9aad82b00330 R08: 0000000000000000 R09: ffff9aad87ee3d10
+[ 770.948874] R10: 0000000000000200 R11: 0000000000000000 R12: ffff9aad82b00330
+[ 770.948874] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
+[ 770.948875] FS: 00007ff1b2f6bb40(0000) GS:ffff9aaf37d00000(0000) knlGS:0000000000000000
+[ 770.948878] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+[ 770.948878] CR2: 0000555f345cb666 CR3: 00000001462dc005 CR4: 0000000000370ee0
+[ 770.948879] Call Trace:
+[ 770.948880] <TASK>
+[ 770.948881] ? show_trace_log_lvl+0x1c4/0x2df
+[ 770.948884] ? show_trace_log_lvl+0x1c4/0x2df
+[ 770.948886] ? __cancel_work_timer+0x103/0x190
+[ 770.948887] ? __flush_work.isra.0+0x212/0x230
+[ 770.948889] ? __warn+0x81/0x110
+[ 770.948891] ? __flush_work.isra.0+0x212/0x230
+[ 770.948892] ? report_bug+0x10a/0x140
+[ 770.948895] ? handle_bug+0x3c/0x70
+[ 770.948898] ? exc_invalid_op+0x14/0x70
+[ 770.948899] ? asm_exc_invalid_op+0x16/0x20
+[ 770.948903] ? __flush_work.isra.0+0x212/0x230
+[ 770.948905] __cancel_work_timer+0x103/0x190
+[ 770.948907] ? _raw_spin_unlock_irqrestore+0xa/0x30
+[ 770.948910] drm_kms_helper_poll_disable+0x1e/0x40 [drm_kms_helper]
+[ 770.948923] drm_mode_config_helper_suspend+0x1c/0x80 [drm_kms_helper]
+[ 770.948933] ? __pfx_vmbus_suspend+0x10/0x10 [hv_vmbus]
+[ 770.948942] hyperv_vmbus_suspend+0x17/0x40 [hyperv_drm]
+[ 770.948944] ? __pfx_vmbus_suspend+0x10/0x10 [hv_vmbus]
+[ 770.948951] dpm_run_callback+0x4c/0x140
+[ 770.948954] __device_suspend_noirq+0x74/0x220
+[ 770.948956] dpm_noirq_suspend_devices+0x148/0x2a0
+[ 770.948958] dpm_suspend_end+0x54/0xe0
+[ 770.948960] create_image+0x14/0x290
+[ 770.948963] hibernation_snapshot+0xd6/0x200
+[ 770.948964] hibernate.cold+0x8b/0x1fb
+[ 770.948967] state_store+0xcd/0xd0
+[ 770.948969] kernfs_fop_write_iter+0x124/0x1b0
+[ 770.948973] new_sync_write+0xff/0x190
+[ 770.948976] vfs_write+0x1ef/0x280
+[ 770.948978] ksys_write+0x5f/0xe0
+[ 770.948979] do_syscall_64+0x5c/0x90
+[ 770.948981] ? syscall_exit_work+0x103/0x130
+[ 770.948983] ? syscall_exit_to_user_mode+0x12/0x30
+[ 770.948985] ? do_syscall_64+0x69/0x90
+[ 770.948986] ? do_syscall_64+0x69/0x90
+[ 770.948987] ? do_user_addr_fault+0x1d6/0x6a0
+[ 770.948989] ? do_syscall_64+0x69/0x90
+[ 770.948990] ? exc_page_fault+0x62/0x150
+[ 770.948992] entry_SYSCALL_64_after_hwframe+0x72/0xdc
+[ 770.948995] RIP: 0033:0x7ff1b293eba7
+[ 770.949010] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
+[ 770.949011] RSP: 002b:00007ffde3912128 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
+[ 770.949012] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007ff1b293eba7
+[ 770.949013] RDX: 0000000000000005 RSI: 00007ffde3912210 RDI: 0000000000000004
+[ 770.949014] RBP: 00007ffde3912210 R08: 000055d7dd4c9510 R09: 00007ff1b29b14e0
+[ 770.949014] R10: 00007ff1b29b13e0 R11: 0000000000000246 R12: 0000000000000005
+[ 770.949015] R13: 000055d7dd4c53e0 R14: 0000000000000005 R15: 00007ff1b29f69e0
+[ 770.949016] </TASK>
+[ 770.949017] ---[ end trace e6fa0618bfa2f31d ]---
+
+Built-on: Rhel9, Ubuntu22
+Signed-off-by: Shradha Gupta <shradhagupta@linux.microsoft.com>
+Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
+Link: https://patchwork.freedesktop.org/patch/msgid/1706856208-9617-1-git-send-email-shradhagupta@linux.microsoft.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/drm_modeset_helper.c | 19 ++++++++++++++++---
+ drivers/gpu/drm/drm_probe_helper.c | 12 ++++++++++--
+ 2 files changed, 26 insertions(+), 5 deletions(-)
+
+--- a/drivers/gpu/drm/drm_modeset_helper.c
++++ b/drivers/gpu/drm/drm_modeset_helper.c
+@@ -198,13 +198,22 @@ int drm_mode_config_helper_suspend(struc
+
+ if (!dev)
+ return 0;
++ /*
++ * Don't disable polling if it was never initialized
++ */
++ if (dev->mode_config.poll_enabled)
++ drm_kms_helper_poll_disable(dev);
+
+- drm_kms_helper_poll_disable(dev);
+ drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 1);
+ state = drm_atomic_helper_suspend(dev);
+ if (IS_ERR(state)) {
+ drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
+- drm_kms_helper_poll_enable(dev);
++ /*
++ * Don't enable polling if it was never initialized
++ */
++ if (dev->mode_config.poll_enabled)
++ drm_kms_helper_poll_enable(dev);
++
+ return PTR_ERR(state);
+ }
+
+@@ -244,7 +253,11 @@ int drm_mode_config_helper_resume(struct
+ dev->mode_config.suspend_state = NULL;
+
+ drm_fb_helper_set_suspend_unlocked(dev->fb_helper, 0);
+- drm_kms_helper_poll_enable(dev);
++ /*
++ * Don't enable polling if it is not initialized
++ */
++ if (dev->mode_config.poll_enabled)
++ drm_kms_helper_poll_enable(dev);
+
+ return ret;
+ }
+--- a/drivers/gpu/drm/drm_probe_helper.c
++++ b/drivers/gpu/drm/drm_probe_helper.c
+@@ -235,6 +235,9 @@ drm_connector_mode_valid(struct drm_conn
+ * Drivers can call this helper from their device resume implementation. It is
+ * not an error to call this even when output polling isn't enabled.
+ *
++ * If device polling was never initialized before, this call will trigger a
++ * warning and return.
++ *
+ * Note that calls to enable and disable polling must be strictly ordered, which
+ * is automatically the case when they're only call from suspend/resume
+ * callbacks.
+@@ -246,7 +249,8 @@ void drm_kms_helper_poll_enable(struct d
+ struct drm_connector_list_iter conn_iter;
+ unsigned long delay = DRM_OUTPUT_POLL_PERIOD;
+
+- if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
++ if (drm_WARN_ON_ONCE(dev, !dev->mode_config.poll_enabled) ||
++ !drm_kms_helper_poll || dev->mode_config.poll_running)
+ return;
+
+ drm_connector_list_iter_begin(dev, &conn_iter);
+@@ -742,14 +746,18 @@ EXPORT_SYMBOL(drm_kms_helper_is_poll_wor
+ * not an error to call this even when output polling isn't enabled or already
+ * disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable().
+ *
++ * If however, the polling was never initialized, this call will trigger a
++ * warning and return
++ *
+ * Note that calls to enable and disable polling must be strictly ordered, which
+ * is automatically the case when they're only call from suspend/resume
+ * callbacks.
+ */
+ void drm_kms_helper_poll_disable(struct drm_device *dev)
+ {
+- if (!dev->mode_config.poll_enabled)
++ if (drm_WARN_ON(dev, !dev->mode_config.poll_enabled))
+ return;
++
+ cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
+ }
+ EXPORT_SYMBOL(drm_kms_helper_poll_disable);
projects / thirdparty / kernel / stable-queue.git / commitdiff
